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Parallella Community • View topic - DMA code and questions
Page 1 of 2

DMA code and questions

PostPosted: Thu Jul 18, 2013 5:08 pm
by Gravis
can you read/write memory on another core while that other core is idle?
is it correct that the SYNC interrupt on the core is like everything else in the IVT with the exception that it's the only interrupt that can be called when the core is idle?
what happens when one send and IRQ that isnt SYNC to an idle core?
can memory be read or written from another core while that other core is in the middle of using that memory? (it's bad idea but i gotta know!)
if so, does it vary between instructions due to the variable length pipeline and what stage of the pipeline would the reading/writing happen?

i'm hoping you can provide a code snippet (assembly) of...
- writing to memory on another core
- reading memory from another core
- executing an IRQ on another core

i get the feeling memory and IRQ execution are done in the same manner but i want to be sure.

if you didnt guess, i'm working on the DMA engine and DMA handling for my emulator. :)

Re: DMA code and questions

PostPosted: Thu Jul 18, 2013 6:29 pm
by ysapir

Re: DMA code and questions

PostPosted: Fri Jul 19, 2013 2:14 pm
by Gravis

Re: DMA code and questions

PostPosted: Sat Jul 20, 2013 1:02 pm
by ysapir

Re: DMA code and questions

PostPosted: Sun Jul 21, 2013 1:04 am
by Gravis

Re: DMA code and questions

PostPosted: Sun Jul 21, 2013 8:26 am
by ysapir

Re: DMA code and questions

PostPosted: Sun Jul 21, 2013 9:00 am
by Gravis

Re: DMA code and questions

PostPosted: Sun Jul 21, 2013 11:12 am
by ysapir

Re: DMA code and questions

PostPosted: Sun Jul 21, 2013 12:16 pm
by Gravis

Re: DMA code and questions

PostPosted: Sun Jul 21, 2013 2:37 pm
by ysapir
@Gravis, ILATST is a register, not a symbol. You cannot use "mov" to move it (there's movsts/movfs for that), and even if you could, it would be the local copy and not the global address.

How did you come to (12,41)?